31.SM.201-32B0 KEB
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The KEB 31.SM.201-32B0 is a synchronous-servo motor from the SM Synchronous Servo Motors series with a rated power of 0.16 kW and a rated speed of 3000 rpm. It features self-cooling, IP54 protection, and includes a two-pole resolver encoder for feedback. The motor includes a holding brake with a torque of 4.5 Nm and operates at a rated current of 1.0 A.
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Product Description:
The 31.SM.201-32B0 synchronous servo motor is built by KEB as part of the SM Synchronous Servo Motors series. Intended for precision control tasks, the unit delivers closed-loop motion in compact automation stations. A two-pole SSBH-15-E-5 resolver returns the rotor position in real time, allowing the motor to integrate with compatible KEB drive electronics for accurate speed and position regulation.
The continuous output reaches 0.16 kW at a rated torque of 0.55 Nm. The shaft can operate steadily at 3000 rpm when the drive supplies a current of 1.0 A. The nominal terminal voltage is 190 V, making the motor suitable for 230 V class inverters or 320 V DC buses used in low-power control cabinets. Its long-frame, three-phase synchronous design provides additional stack length, while self-cooling keeps the frame temperature within operating limits during continuous duty. The integrated brake draws 0.50 A at 24 V and produces 4.5 Nm of holding torque, allowing it to secure vertical loads when the shaft is stationary. A keyed shaft permits direct connection to a coupling, and the B5 IFT5 flange supports attachment to compatible gearheads. The motor has a mass of 1.9 kg, which limits the weight added to moving machinery. Its rotor inertia is 0.45 kg cm², supporting rapid acceleration and responsive changes in speed.
The electrical model has a voltage constant of 52.0 V/1000 rpm, allowing back electromotive force to develop predictably during vector control. The winding has an inductance of 31.0 mH and a resistance of 30.3 Ω; these values affect current-loop response and heat generation in the stator. The enclosure carries an IP54 protection rating, which limits dust ingress and protects the motor from splashing water. The stall current is 1.08 A, while the stall torque is 0.65 Nm. The motor uses a size 31 frame that provides a compact mounting envelope for automated equipment. During locked-rotor operation or static holding, the drive must observe the stated stall limits to prevent excessive winding temperature.
